Chain pipe-wrench



(No Model.)

O. L. MAHNIGKE. 01mm PIPE WRENGH..

No. 514,721. Patentedfeb. 13, 1894.

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ATENT FFICE.

CHARLES L. MAHNICKE, OF COLUMBUS, OHIO.

CHAIN PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent N 0. 514,721, datedFebruary 13, 1894. Application filed April 6, 1891-' Serial No. 387,849-(No model.)

To all whom it may concern:

Be 1t known that I, CHARLES L. MAHNICKE,

a citizen of the United States, residing at O0- lumbus, in the county ofFranklin and State of Ohio, have invented a certain new and usefulImprovement in Chain Pipe-Wrenches, of which the following is aspecification. v

Myinvention has particular relation to the improvement of theconstruction shown in my former patent, No. 415,047, of November 12,

1889, and my'improvement consists in the construction, arrangement andcombination of parts hereinafterset forth.

' The objects of my invention are to provide improved means foradjusting and securing the chain to the wrench bar, to provide the barwith separated parallel rows of reversing teeth; to provide an improvedconnection of the inner end of the chain with the wrench bar and tootherwise produce a superior form of pipe wrench, in a simple anddurable manner. These objects I accomplish in the manner illustrated inthe accompanying drawings, in which- I I Figure 1 is a side elevation ofmy improved wrench applied to a pipe which is shown in cross section.Fig. 2 is a transverse section of the wrench bars taken on line as a: ofFig. 1, and Fig.3 is a plan view of my improved wrench, showing. thesame applied to a section of piping.

Similar letters refer to'similar parts throughout the several views.

a represents the wrench bar, which consists as shown of a head 17 and arear extension or handle portion of thereof. The head portion 1) is asshown in the drawings of somewhat greater depth or thickness than itshandle portion and is provided on its under side and forward end portionwith an inverted U- shaped groove 0 which separates as shown,

the lower side and forwardend of the barj edges 0 are out to form teeth6, the teeth of one side of said notch center being inclined of thecatch lug fthe end of the bar is in clined rearwardly to meet the upperside thereof as shown atf'. At the meeting point of the inclined endportion f and upper side of the bar, the head of'the latter is providedwith two oppositely located projecting catchlugs g, one of which extendsfrom and is formed with each of the separated portions c of the bar. Theforward faces of these lugs g are also concaved or curved to conform tothe curve of a chain link.

irepresen'tsthe chain, the inner or rear link of which receives thecentral portion of a transverse pin d,which extends through the deeperrear end of the groove 0 and has its ends fixed in the sides of the bar.In this manner, the chain is made secure at one end to the Wrench bar.In grasping and turning a pipe which it is desired to turn forwardly orfrom the operator, the chain 1' is placed beneath the pipe 70, thelatterdrawn upward by said chain and its peripherybrought into contact withthe two forward rows of teeth e,

which are inclined outwardly. The outer portion of the chain is thendrawn over the end of the bar head, two of its upright links beingsupported between the pairs of projectionsfand g and the interveninghorizontal link having its ends in engagement with the inner curvedfaces of the lug f. The lugs 9 also form a stop bearing for the forwardend of the next horizontal link of the chain above the one heretoforementioned. I

'As described in my said former patent, the direction in which the pipeis turned may be reversed by causing the periphery thereof, to engagewith the rearwardlyinclined teeth e.

In either case the turn of the pipe is produced through a rocking orbackward and forward movement of the bar.

From the construction hereinshown and described, it is obvious thata'chain attachmentstudor similar projection isunneces sary on the outerside of the bar and that the necessity of doubling the chain about thepiping and the formation of notches for the engagement of the chain asdescribed, in my said former patent, is obviated. It will also be seenthat the operation herein described is exceedingly simple and that thechain may be readily locked into position Without annecessary loss oftime.

Owing to the formation of the groove or recess c, it will be observedthat the periphery of the pipe will be subjected to the bite of two setsof teeth and that a more firm grip upon the pipe will be had.

Having now fully described myinvention, what I claim, and desire tosecure by Letters Patent, is-

In a chain pipe wrench, the combination with a bar having a groove orrecess on the under side and forward end of said bar head, two pairs oflugs f and g projecting as described from the forward end of said barhead and on opposite sides of the groove 0, the under side of the barhead having a V-shaped notch, oppositely inclined teeth on oppositesides of the groove 0 and the notched vertex of a chain having one ofits ends pivoted within the rear end of said groove 0 and the links ofthe remaining end adapted to lie between and engage with the pairs oflugsf and g, substantially as described.

CHARLES L. MAHNICKE.

In presence of BARTON GRIFFITH, C. C. SHEPHERD.

